package ooday01;

public class StudentTest {
    public static void main(String[] args) {
        Student st1=new Student(4,"lisi");
        st1.age=23;
        Student st2=st1;
        st2.name="zhangsan";
        Student st3=new Student();
        Student st4=new Student(8,"李世民","三年一班","323432423");
        Student st33=new Student();
        st1.sayHi();
        st2.sayHi();
        st3.sayHi();
        st4.sayHi();
    }
}
